1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
22 #include <dbus/dbus.h>
28 #include <sys/types.h>
37 #include "mount-setup.h"
38 #include "hostname-setup.h"
39 #include "loopback-setup.h"
40 #include "load-fragment.h"
47 ACTION_DUMP_CONFIGURATION_ITEMS
48 } action = ACTION_RUN;
50 static char *default_unit = NULL;
51 static ManagerRunningAs running_as = _MANAGER_RUNNING_AS_INVALID;
53 static bool dump_core = true;
54 static bool crash_shell = false;
55 static int crash_chvt = -1;
56 static bool confirm_spawn = false;
57 static FILE* serialization = NULL;
59 _noreturn static void freeze(void) {
64 static void nop_handler(int sig) {
67 _noreturn static void crash(int sig) {
70 log_error("Caught <%s>, not dumping core.", strsignal(sig));
75 /* We want to wait for the core process, hence let's enable SIGCHLD */
77 sa.sa_handler = nop_handler;
78 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
79 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
81 if ((pid = fork()) < 0)
82 log_error("Caught <%s>, cannot fork for core dump: %s", strsignal(sig), strerror(errno));
87 /* Enable default signal handler for core dump */
89 sa.sa_handler = SIG_DFL;
90 assert_se(sigaction(sig, &sa, NULL) == 0);
92 /* Don't limit the core dump size */
94 rl.rlim_cur = RLIM_INFINITY;
95 rl.rlim_max = RLIM_INFINITY;
96 setrlimit(RLIMIT_CORE, &rl);
98 /* Just to be sure... */
99 assert_se(chdir("/") == 0);
101 /* Raise the signal again */
104 assert_not_reached("We shouldn't be here...");
110 /* Order things nicely. */
111 if ((r = waitpid(pid, &status, 0)) < 0)
112 log_error("Caught <%s>, waitpid() failed: %s", strsignal(sig), strerror(errno));
113 else if (!WCOREDUMP(status))
114 log_error("Caught <%s>, core dump failed.", strsignal(sig));
116 log_error("Caught <%s>, dumped core as pid %llu.", strsignal(sig), (unsigned long long) pid);
127 log_info("Executing crash shell in 10s...");
130 /* Let the kernel reap children for us */
132 sa.sa_handler = SIG_IGN;
133 sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
134 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
136 if ((pid = fork()) < 0)
137 log_error("Failed to fork off crash shell: %s", strerror(errno));
139 execl("/bin/sh", "/bin/sh", NULL);
141 log_error("execl() failed: %s", strerror(errno));
145 log_info("Successfully spawned crash shall as pid %llu.", (unsigned long long) pid);
148 log_info("Freezing execution.");
152 static void install_crash_handler(void) {
157 sa.sa_handler = crash;
158 sa.sa_flags = SA_NODEFER;
160 assert_se(sigaction(SIGSEGV, &sa, NULL) == 0);
161 assert_se(sigaction(SIGILL, &sa, NULL) == 0);
162 assert_se(sigaction(SIGFPE, &sa, NULL) == 0);
163 assert_se(sigaction(SIGBUS, &sa, NULL) == 0);
164 assert_se(sigaction(SIGQUIT, &sa, NULL) == 0);
165 assert_se(sigaction(SIGABRT, &sa, NULL) == 0);
168 static int console_setup(bool do_reset) {
169 int tty_fd = -1, null_fd = -1, r = 0;
171 /* If we are init, we connect stdout/stderr to /dev/console
172 * and stdin to /dev/null and make sure we don't have a
173 * controlling tty. */
177 if ((tty_fd = open_terminal("/dev/console", O_WRONLY)) < 0) {
178 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
183 if ((null_fd = open("/dev/null", O_RDONLY)) < 0) {
184 log_error("Failed to open /dev/null: %m");
190 assert(null_fd >= 3);
193 if (reset_terminal(tty_fd) < 0)
194 log_error("Failed to reset /dev/console: %m");
196 if (dup2(tty_fd, STDOUT_FILENO) < 0 ||
197 dup2(tty_fd, STDERR_FILENO) < 0 ||
198 dup2(null_fd, STDIN_FILENO) < 0) {
199 log_error("Failed to dup2() device: %m");
208 close_nointr_nofail(tty_fd);
211 close_nointr_nofail(null_fd);
216 static int set_default_unit(const char *u) {
221 if (!(c = strdup(u)))
229 static int parse_proc_cmdline_word(const char *word) {
231 static const char * const rlmap[] = {
232 "single", SPECIAL_RUNLEVEL1_TARGET,
233 "-s", SPECIAL_RUNLEVEL1_TARGET,
234 "s", SPECIAL_RUNLEVEL1_TARGET,
235 "S", SPECIAL_RUNLEVEL1_TARGET,
236 "1", SPECIAL_RUNLEVEL1_TARGET,
237 "2", SPECIAL_RUNLEVEL2_TARGET,
238 "3", SPECIAL_RUNLEVEL3_TARGET,
239 "4", SPECIAL_RUNLEVEL4_TARGET,
240 "5", SPECIAL_RUNLEVEL5_TARGET
243 if (startswith(word, "systemd.default="))
244 return set_default_unit(word + 16);
246 else if (startswith(word, "systemd.log_target=")) {
248 if (log_set_target_from_string(word + 19) < 0)
249 log_warning("Failed to parse log target %s. Ignoring.", word + 19);
251 } else if (startswith(word, "systemd.log_level=")) {
253 if (log_set_max_level_from_string(word + 18) < 0)
254 log_warning("Failed to parse log level %s. Ignoring.", word + 18);
256 } else if (startswith(word, "systemd.dump_core=")) {
259 if ((r = parse_boolean(word + 18)) < 0)
260 log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
264 } else if (startswith(word, "systemd.crash_shell=")) {
267 if ((r = parse_boolean(word + 20)) < 0)
268 log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
273 } else if (startswith(word, "systemd.confirm_spawn=")) {
276 if ((r = parse_boolean(word + 22)) < 0)
277 log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
281 } else if (startswith(word, "systemd.crash_chvt=")) {
284 if (safe_atoi(word + 19, &k) < 0)
285 log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
289 } else if (startswith(word, "systemd.")) {
291 log_warning("Unknown kernel switch %s. Ignoring.", word);
293 log_info("Supported kernel switches:");
294 log_info("systemd.default=UNIT Default unit to start");
295 log_info("systemd.log_target=console|kmsg|syslog Log target");
296 log_info("systemd.log_level=LEVEL Log level");
297 log_info("systemd.dump_core=0|1 Dump core on crash");
298 log_info("systemd.crash_shell=0|1 On crash run shell");
299 log_info("systemd.crash_chvt=N Change to VT #N on crash");
300 log_info("systemd.confirm_spawn=0|1 Confirm every process spawn");
305 /* SysV compatibility */
306 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
307 if (streq(word, rlmap[i]))
308 return set_default_unit(rlmap[i+1]);
314 static int parse_proc_cmdline(void) {
321 if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
322 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(errno));
326 FOREACH_WORD_QUOTED(w, l, line, state) {
329 if (!(word = strndup(w, l))) {
334 r = parse_proc_cmdline_word(word);
348 static int parse_argv(int argc, char *argv[]) {
351 ARG_LOG_LEVEL = 0x100,
356 ARG_DUMP_CONFIGURATION_ITEMS,
361 static const struct option options[] = {
362 { "log-level", required_argument, NULL, ARG_LOG_LEVEL },
363 { "log-target", required_argument, NULL, ARG_LOG_TARGET },
364 { "default", required_argument, NULL, ARG_DEFAULT },
365 { "running-as", required_argument, NULL, ARG_RUNNING_AS },
366 { "test", no_argument, NULL, ARG_TEST },
367 { "help", no_argument, NULL, 'h' },
368 { "dump-configuration-items", no_argument, NULL, ARG_DUMP_CONFIGURATION_ITEMS },
369 { "confirm-spawn", no_argument, NULL, ARG_CONFIRM_SPAWN },
370 { "deserialize", required_argument, NULL, ARG_DESERIALIZE },
379 while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
384 if ((r = log_set_max_level_from_string(optarg)) < 0) {
385 log_error("Failed to parse log level %s.", optarg);
393 if ((r = log_set_target_from_string(optarg)) < 0) {
394 log_error("Failed to parse log target %s.", optarg);
402 if ((r = set_default_unit(optarg)) < 0) {
403 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
409 case ARG_RUNNING_AS: {
412 if ((as = manager_running_as_from_string(optarg)) < 0) {
413 log_error("Failed to parse running as value %s", optarg);
422 action = ACTION_TEST;
425 case ARG_DUMP_CONFIGURATION_ITEMS:
426 action = ACTION_DUMP_CONFIGURATION_ITEMS;
429 case ARG_CONFIRM_SPAWN:
430 confirm_spawn = true;
433 case ARG_DESERIALIZE: {
437 if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
438 log_error("Failed to parse deserialize option %s.", optarg);
442 if (!(f = fdopen(fd, "r"))) {
443 log_error("Failed to open serialization fd: %m");
448 fclose(serialization);
456 action = ACTION_HELP;
463 log_error("Unknown option code %c", c);
467 /* PID 1 will get the kernel arguments as parameters, which we
468 * ignore and unconditionally read from
469 * /proc/cmdline. However, we need to ignore those arguments
471 if (running_as != MANAGER_INIT && optind < argc) {
472 log_error("Excess arguments.");
479 static int help(void) {
481 printf("%s [options]\n\n"
482 " -h --help Show this help\n"
483 " --default=UNIT Set default unit\n"
484 " --log-level=LEVEL Set log level\n"
485 " --log-target=TARGET Set log target (console, syslog, kmsg)\n"
486 " --running-as=AS Set running as (init, system, session)\n"
487 " --test Determine startup sequence, dump it and exit\n"
488 " --dump-configuration-items Dump understood unit configuration items\n"
489 " --confirm-spawn Ask for confirmation when spawning processes\n",
495 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
504 if ((r = manager_open_serialization(&f)) < 0) {
505 log_error("Failed to create serialization faile: %s", strerror(-r));
509 if (!(fds = fdset_new())) {
511 log_error("Failed to allocate fd set: %s", strerror(-r));
515 if ((r = manager_serialize(m, f, fds)) < 0) {
516 log_error("Failed to serialize state: %s", strerror(-r));
520 if (fseeko(f, 0, SEEK_SET) < 0) {
521 log_error("Failed to rewind serialization fd: %m");
525 if ((r = fd_cloexec(fileno(f), false)) < 0) {
526 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
530 if ((r = fdset_cloexec(fds, false)) < 0) {
531 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
549 int main(int argc, char *argv[]) {
555 bool reexecute = false;
558 running_as = MANAGER_INIT;
559 else if (getuid() == 0)
560 running_as = MANAGER_SYSTEM;
562 running_as = MANAGER_SESSION;
564 if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
567 /* Mount /proc, /sys and friends, so that /proc/cmdline and
568 * /proc/$PID/fd is available. */
569 if (mount_setup() < 0)
572 /* Reset all signal handlers. */
573 assert_se(reset_all_signal_handlers() == 0);
575 /* If we are init, we can block sigkill. Yay. */
576 ignore_signal(SIGKILL);
577 ignore_signal(SIGPIPE);
579 if (running_as != MANAGER_SESSION)
580 if (parse_proc_cmdline() < 0)
583 log_parse_environment();
585 if (parse_argv(argc, argv) < 0)
588 if (action == ACTION_HELP) {
591 } else if (action == ACTION_DUMP_CONFIGURATION_ITEMS) {
592 unit_dump_config_items(stdout);
597 assert_se(action == ACTION_RUN || action == ACTION_TEST);
599 /* Remember open file descriptors for later deserialization */
601 if ((r = fdset_new_fill(&fds)) < 0) {
602 log_error("Failed to allocate fd set: %s", strerror(-r));
606 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
608 close_all_fds(NULL, 0);
610 /* Set up PATH unless it is already set */
612 "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
613 running_as == MANAGER_INIT);
615 /* Move out of the way, so that we won't block unmounts */
616 assert_se(chdir("/") == 0);
618 if (running_as != MANAGER_SESSION) {
619 /* Become a session leader if we aren't one yet. */
622 /* Disable the umask logic */
626 /* Reset the console, but only if this is really init and we
627 * are freshly booted */
628 if (running_as == MANAGER_INIT && action == ACTION_RUN)
629 console_setup(getpid() == 1 && !serialization);
631 /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
632 dbus_connection_set_change_sigpipe(FALSE);
634 /* Open the logging devices, if possible and necessary */
638 /* Make sure we leave a core dump without panicing the
641 install_crash_handler();
643 log_debug("systemd running in %s mode.", manager_running_as_to_string(running_as));
645 if (running_as == MANAGER_INIT) {
650 if ((r = manager_new(running_as, confirm_spawn, &m)) < 0) {
651 log_error("Failed to allocate manager object: %s", strerror(-r));
655 if ((r = manager_startup(m, serialization, fds)) < 0)
656 log_error("Failed to fully startup daemon: %s", strerror(-r));
659 /* This will close all file descriptors that were opened, but
660 * not claimed by any unit. */
667 fclose(serialization);
668 serialization = NULL;
670 log_debug("Activating default unit: %s", default_unit);
672 if ((r = manager_load_unit(m, default_unit, NULL, &target)) < 0) {
673 log_error("Failed to load default target: %s", strerror(-r));
675 log_info("Trying to load rescue target...");
676 if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &target)) < 0) {
677 log_error("Failed to load rescue target: %s", strerror(-r));
682 if (action == ACTION_TEST) {
683 printf("-> By units:\n");
684 manager_dump_units(m, stdout, "\t");
687 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &job)) < 0) {
688 log_error("Failed to start default target: %s", strerror(-r));
692 if (action == ACTION_TEST) {
693 printf("-> By jobs:\n");
694 manager_dump_jobs(m, stdout, "\t");
701 if ((r = manager_loop(m)) < 0) {
702 log_error("Failed to run mainloop: %s", strerror(-r));
706 switch (m->exit_code) {
714 if ((r = manager_reload(m)) < 0)
715 log_error("Failed to reload: %s", strerror(-r));
718 case MANAGER_REEXECUTE:
719 if (prepare_reexecute(m, &serialization, &fds) < 0)
723 log_debug("Reexecuting.");
727 assert_not_reached("Unknown exit code.");
740 const char *args[11];
744 assert(serialization);
747 args[i++] = SYSTEMD_BINARY_PATH;
749 args[i++] = "--log-level";
750 args[i++] = log_level_to_string(log_get_max_level());
752 args[i++] = "--log-target";
753 args[i++] = log_target_to_string(log_get_target());
755 args[i++] = "--running-as";
756 args[i++] = manager_running_as_to_string(running_as);
758 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
761 args[i++] = "--deserialize";
765 args[i++] = "--confirm-spawn";
769 assert(i <= ELEMENTSOF(args));
771 execv(args[0], (char* const*) args);
773 log_error("Failed to reexecute: %m");
777 fclose(serialization);